Styles from Dropdown:
Custom Classes
btn-secondary
btn-light
btn-dark
btn-pink
btn-indigo
btn-purple
btn-primary-darker
btn-gray-100
btn-gray-200
btn-gray-300
btn-gray-400
btn-gray-500
btn-gray-600
btn-black
btn-outline-primary
btn-outline-secondary
btn-outline-success
btn-outline-info
btn-outline-warning
btn-outline-danger
btn-outline-light
btn-outline-dark
btn-outline-pink
btn-outline-indigo
btn-outline-purple
btn-outline-primary-darker
btn-outline-gray-100
btn-outline-gray-200
btn-outline-gray-300
btn-outline-gray-400
btn-outline-gray-500
btn-outline-gray-600
btn-outline-black